Absolutely correct. This trick is a mind trick actually. You pick 1 card, memorize and concentrate it. You will not have the time to remeber all the suits except for the 1 you pick. When the cards is opened, your card selected card will not be there, because all the original card has been replace with the other suits, which you don't even bother to memorize at the first place. You can do it with normal card in front of your spectator. They will not notice the otehr card except for their chosen card. How to do the handling, it's depend on yourself. Simple mind trick, but a good one.